DirectoryIterator::key

(PHP 5, PHP 7, PHP 8)

DirectoryIterator::key — Return the key for the current DirectoryIterator item

说明

public DirectoryIterator::key ( ) : int|false

Get the key for the current DirectoryIterator item.

参数

此函数没有参数。

返回值

The key for the current DirectoryIterator item on success, or false on failure.

范例

Example #1 A DirectoryIterator::key() example


<?php
$dir = new DirectoryIterator(dirname(__FILE__));
foreach ($dir as $fileinfo) {
    if (!$fileinfo->isDot()) {
        echo $fileinfo->key() . " => " . $fileinfo->getFilename() . "\n";
    }
}
?>

以上例程的输出类似于：

0 => apple.jpg
1 => banana.jpg
2 => index.php
3 => pear.jpg

参见

DirectoryIterator::current() - Return the current DirectoryIterator item
DirectoryIterator::next() - Move forward to next DirectoryIterator item
DirectoryIterator::rewind() - Rewind the DirectoryIterator back to the start
DirectoryIterator::valid() - Check whether current DirectoryIterator position is a valid file
Iterator::key() - 返回当前元素的键

User Contributed Notes

There are no user contributed notes for this page.